__author__ = 'CrazyCode'

"""

    Modules


    If you quit from the Python interpreter and enter it again , the definitions you have made (functions and variables ) are lost .

    Therefore , if you want to write a somewhat longer program, you are better off using a text editor to prepare the input for the interpreter and running it with that file as input instead.

    This is known as creating a script .

    As your program get longer , you may want to split it into several files for easier maintenance.

    You may also want to use a handy function that you've written in several programs without copying its definition into each program.

    To support this , Python has a way to put definitions in a file and use them in a script or in an interactive instance of the interpreter.

    Such a file is caled a module ;

    definitions from a module can be imported into other modules or into the main module ( the collection of variables taht you have access to in a script executed at the top level and in calculator mode).

    A module is a file containing Ppython definitions and statements.

    A module is a file containing Python definitions and statements.

    The file name is the module name with the suffix .py append .

    Within a module , the module's name is available as the value of global variable __name__ .

    For instance, use your favorite text editor to create a file called fibo.py in current directory with the following contents:


    More and Modules

    A module can contain executable statements as well as function definitions .
    These statments are intended to initialize the module.
    They are executed only the first time the module name is encountered in an import statement.

    Each module has its own private symbol table, which is used as gloabl symbol table by all functions definede in the module .

    Thus , the author of a module can use gloabl variables in the module without worry about accidental clashes with a user's global variables.

    On the other hand, if you know what you are doing you can touch a module's global variables with the same notation used to refer to its functions , modname.itemname.

    Modules can import other modules . It is customary but not required to place all import statements at the beginning of a module .

    The imported module names are placed in the importing module's gloable symbol table .

    There is a variable of the import statement that imports names from a module directory into the importing module's symbol table.

    For example:
    from fibo import fib , fib2
    fib(500)

    thsi does not introduce the module name from which the imports are taken in the local symbol table

    There is even a variant to import all names that a module defines.

    This imports all name exception those begging with an underscore(_).

    In most cases Python programmers do not use this facility since it introduces an unknown set of names into the interpreter , possibly hiding some things you have already defined .


    Note that in general the practice of importing * from a module or package is frowned upon ,
    since it often casuses poorly readable code .

    However , it is okay to use it to save typing in interactive sessions.


    NOTE: for efficiency reasons , each module is only imported once per inpterpreter session. Therefore , if you change your modules, you must restart the inpterpreter

"""



# Fibonacci numbers module

def fib(n):
    a, b = 0, 1
    while b < n:
        print(b, end=" ")
        a, b = b, a + b
    print()


def fib2(n):
    result = []
    a, b = 0, 1
    while b < n:
        result.append(b)
        a, b = b, a + b
    return result